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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc610675766d8ebe1dc6d400b5a4f95123b4032af0c2ec3b590832fd40cc660b' 
  AND token = 'O7pjo3gfwDdmBMefZyAi0z52YivFRTmDk5h8yE4yH3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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