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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0908086a469072cb3812693e40b162b1dfe1e74500bde5cf12a240b343af62b8' 
  AND token = 'zSB4IRK0yLGGnZIlt5lVENzFRSxF4L+3CtkT0rdi4EQ=' 
  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"
    }
  }
}