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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65b70f4672014c85a00882b60fa62341e250d3e7aabee72150c4504a50e641e' 
  AND token = '7L1xoYUqo4aL4F2iqeOr+Yo81LB0H7GEJ8ph1DgNHUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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