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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57b58ab632c4e4d412aa6ddb9035b34a9d1de70730056634889a8426e13fb1a' 
  AND token = 'be67OY2TI5EvNdpd3h/ozb4hXzwl2SnxPC6QAKMmbDw=' 
  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"
    }
  }
}