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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742146e022eeb040dad5f834c0e560d58b0807d50c30c684621e9bd54799d61a' 
  AND token = 'VI/u3ISrSONaXovV8WYa/TBSrg6tkR9jp794fx07YZ0=' 
  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"
    }
  }
}