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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9db3f788856f5e3f91100391c8a97ba341459ad75b0022e094d448c175498e22' 
  AND token = 'Nt6nfhf+b3FC9X8MTboosMGJvSaEulb/aUIC40Cgr5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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