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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c6e981d1261a12e535115b150ced8c03214f73227e8683e6c55a7bcd0a03b6' 
  AND token = '62BLuzYKxpML+CzfMpPiRsQEVVLhXF1kMf62BTNjIlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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