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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6c0595249184b46ea08521e7d77877f06624f6af56116186cb123b92b3ee5a' 
  AND token = 'zMOrE/dzUDRNaB/c3kptOTW8mA17whUcolt/RP0as0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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