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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1df7390520de54e01818183b833b4085de3f3c591aba358793b96cf5bfc1301' 
  AND token = 'Jv35RK8pE+xT8fInJM6aaM2WmPOmTNlJwpge4OmaGF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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