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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa4f9bea9a712091aec82ee44cd8a5c96fb8fb95462f7b6ee413f4468a5ec0a' 
  AND token = 'ye2rwgxNoKYSRLDVN8lx5r5af+or6b59I/T70A65WcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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