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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf31d8fd6b4503b3c94e3398df744ba45f07da4a3e86dddc7b781d0df721d58' 
  AND token = 'XI/eh5awlD6s4RtcHlURI407QzJLnjyPqd+c3iwrW5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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