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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71aedd8c033ccb813e3469e079a2ecd8057fc66bad2514a24e87a61014d36a3' 
  AND token = 'LNH8QUWB4IZeEBoHgP4gtsuWu06zsXC48TK5/fAE810=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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