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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced942d7aec3b00cbf704d0e501ac671409c05f2fda457fe6976e236c38b8a29' 
  AND token = 'bo9FhKsNeo/QInigPPc1ktJjry/MvgbM+czU71E+C+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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