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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4f3a606247f6a2e2a09205ca6897e14de563662c7115e3d858d65dc9769057' 
  AND token = 'j7HsTrSIlUbq7XjeL1Lfr64VYXAOcuA13ex3AsxWaNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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