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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f81d5d9414942259806027614d28ca13e7b7d31e368cdc8bbb00055f0dc7391' 
  AND token = 'oBdx9kVtMXzpF8v4+RIb0uvyvqBe4R8LdubSDDa+X1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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