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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01e515d812487c95a683c34f84ce9f18f9e4eb9f256db96cc18db33044480b3' 
  AND token = 'JfZA628rAAhBmXSoP5VlG3VNkyKjGUB8/ySIxEsDQ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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