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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd743cf6d6460c21518dc9b892c8ed30cd7cd2c8cb4e5fee81990d506270a642c' 
  AND token = '6aT6hlQ6HnbkghhYWWKNI2y3t1/kw3AFIG0q725pjec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}