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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418308d2faf282e35cf90a04b42e887f085ff54adcb7daf47556d7d262bb16ce' 
  AND token = 'UrshNS5/scM/aFRx9lLRM9JlDnBrTTLUBbS8UucrF1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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