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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76417c7feae26a3697f1591f89181cff6b31ad5e7f0542c7ada3591e567ed7d5' 
  AND token = '9TvINlLQ0kLZHNsV39/jt0MxqB2PceGdGuF9dfunyDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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