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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbab9945548ed5c7bebbb7f68210815f4aba79ca84320dd928de68c25f2f25fa' 
  AND token = 'sruXR2WJpVGSTCnIJYSXyJ71ovtG/TzjXi0moZW2ybk=' 
  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"
    }
  }
}