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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92ac4301e55996b673477ad9a3b25d5f3a5e247090c960ee8e7c196d76747d5' 
  AND token = 'NxRLBHcWuHgTchWv3xhe5hiIdGRvfA4SavhP+fB8Ifw=' 
  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"
    }
  }
}