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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd347efc6d602cae65f6b222eb7334623788328d2eebdcbb98d2805586e2f9799' 
  AND token = 'pekHHiowpBPo3rXXIh6NL+iE//iaLLtB50AaNCgN4z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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