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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9bff6d3df05ce1af1148435f7a624cea4f88b51961e6400648b30e7aa4a86f' 
  AND token = '6Dg2HtkOHd9jNEFPgC+KZQ4phiLU5fzEa+lAtN4VD6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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