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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac400a1e5f9f1b8ffce2767d5525b7fb7d796bc75a7867eda5b348f2c8786a28' 
  AND token = 'Sva7v1fl8etnzaqJpYbuz5I+w/6KE7a4SrlaaJgUWc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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