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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933d3928d0075c2d1821dcd715102fbc8b87f7d22f65b38d0da0383701806c4b' 
  AND token = 'Kwps2ceA9+RcJLPd0dOGHRTHygMgvZkVaFSw7cLKdQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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