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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6646c32a10051fd62ea99f200a3f7551eb5069fa5bc1463a41bd2a237c2b6e8' 
  AND token = 'bTN1sizJjjl3rnk4gl4d0xlDDUQnafRVt8cqbhEp06Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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