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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fef5c9b48a8abcc547212abd71b89957148e55ccfee09af961284137805c39f' 
  AND token = 'vxVG/oRVY07Q+x6a5qcse4TnX+mb7f0M+nNT40dn/mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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