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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533a775d23032f5853ac95decf030de6b651b6847c5c2d23c32fe446f29d1e9d' 
  AND token = '9Yr9RQi6BT6tb2AAN01jQP0y7ofpoDAryx0221NIWuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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