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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ce6bf44c06a44fd5615edbe8dc200153c1441fe0b3436b1e4ff195dc5871b3' 
  AND token = 'R3/iqnvNxX5wT75HqJJ0dBLxE/0t4m+Jz1vpGuYCmHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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