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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62b2c82e7ba67307be5f73c8a3bee5cb16abfce81bb1b74a9707b4ef0e33095' 
  AND token = 'JiuIRLmrsRoNeZEARocjwiELXsOpPQKJLZS484YPvnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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