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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfefdbd7509772049be66dfb403c2f87fc3b574d7ac37c2b1e0369290c48b0c6' 
  AND token = '00LXULiamn1Av8NNbn4qO6zP+EEUoTNgdSc7RVephEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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