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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0602f9bebd0b41db068a86eaa65e8c74a31f5af5b38e14040de35654833cc77f' 
  AND token = '4b6YdV9RaaYLunio8JN8VdyC+TRIVQjLAmnDZypcuhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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