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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3187ef956f6a2ac3148853ac4e3518fbb2002eed49eb23f3bfc4a01ce81e202a' 
  AND token = '3BoDid+H7+ev26Gtqg6XmZJAOruO/Wr0t/wpzWvSXPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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