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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9e631ab8fe7869df6ca66360048cb40bae62660c12de888d3e610d6ca3c9b2' 
  AND token = 'iuP68O5vn/iquG9ooV77kbLsKSDtwT3SNSNhmIKzl2Y=' 
  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"
    }
  }
}