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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96c7c1792d95e09d0f98f92c7557d53fec89c3f3dc194077687bf3bb9c2fd46' 
  AND token = 'Ckgd1FattYQULppdHRVLIAaLPkRpYdmwuiZW3b1+wuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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