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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c406b5088a6f0b7abb9d42947c62f21a30a8923324ea7352a58d46423f3acc6f' 
  AND token = 'LU3d3RVv7/Gc4NlsOP9CGZWhRF9s4AroTkxMOovR+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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