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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756d53deee1a6e0cf56a073e5d8900c636bd6d5e85fb00dde86bfa873252b8da' 
  AND token = 'k1n/HH3oql0VVAZrxo4udizkLn133DTsWm2Z0r1gFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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