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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14ff9bbaa8ae6741592e8017d02bf9d9d9b473abd0e4f481d4548e4d2d145fe' 
  AND token = 'JcSQfE0/MO+DBIjD/HsA1LC7h4hT57/xUXQ2b1poWs4=' 
  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"
    }
  }
}