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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a7cf64a2c7b1d572891d0d3ef307b069a7da98c18b938437f0cb544c72aa26' 
  AND token = '+g/mKkXt1Aa2CHzAx02nfMoxIQoCt6rg+ZpdCrkLVBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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