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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3280293a4d21bf4bec815afb756000b80551d8d448e508dd634c1d874cae2d' 
  AND token = 'PtRE/WGIwRnf/KEjt+nK21pB5O2xS4ZDPRwPqAS4CSE=' 
  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"
    }
  }
}