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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cf6f6b3b74abf73f9483eb6c23be1126b9d5a848ff70a9eed8aabd49b69aba' 
  AND token = 'ufDnHYSQ2Yv24p8UxeWzeV6b44yMlKzVDOizTYPdkSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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