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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5132fc7bba3d930ea2ff77a9c8da6a01c4e6021e66c0f16d0443e472d7854669' 
  AND token = 'HsZk4fkMwc4J8lEL0p3d4wYZ0ZGIbwfHSA6nTNQPTWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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