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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6b9e701ad57c1619a1df2ba1ef7961a6a941e3759f1d5c5d16f0123668b437' 
  AND token = 'E5q0Iu8EXUSeAjc93lD28t1LAfoxQ7eWA+kb0oX8ifw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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