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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c12c768fe346a9d52517b490fc40ead666b2ba7ccbfc2734ea6e4934480034' 
  AND token = 'QGsOef8uRep0PJGVILLeBOAvaF8xtW8v56RxYELH2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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