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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbec6e316a9ccbd2cf2d28bb9d1e3ce38e9337cedbfbc2d0aad0129ccaea2440' 
  AND token = 'VMi8cFYNlETPC1bmsDmXddWkaY91HZ4kl2f1dScXqEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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