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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11093a605bd40d66defe80bf4bfa0b0816f2363296e909f67e9bd9c161eb7b2' 
  AND token = 'TNkyuoNkPmRWjkJAYgD9fgNYCVRfvZYRS9G8opoq9TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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