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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf65ba00495fa9c3fa1d4c3d7cccb1efc51c9fc6354b88f110e8584143a6dd86' 
  AND token = '60Gs2G44OOp6ZeWg74XOf/5YCQ46F3oFSP0/CgUJqBQ=' 
  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"
    }
  }
}