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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbac9845a1e726346ecb5fba5b24866a7fc835e9e88a1c8c7a71680c070ccd1' 
  AND token = 'pA2AOOiMfCo9r8uS8Y086H5WxBc8T4i+rvKSYjpt+HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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